The Research And Preparation Of Biologic Compound Oil Displacement

Oil industry, which is one of the pillar industries of china's national economy, exerts an important influence to the development of china's national economic. Facing the status of high oil price and shortage of domestic oil supply, solving the conflict between supply and demand of oil as well as easing the pressure on national oil security, it becomes one of the main research fields to many petroleum workers that we have to develop a low-cost crude oil extraction technology and improve oil recovery significantly.This article is based on the principle of ASP (alkali/ surfactant/ polymer) flooding, focusing on the characteristics of high plants/animals and microbes protein contents of the cities residual activated sludge, via alkaline hydrolysis and optimize the hydrolysis process to produce hydrolysis of activated sludge. The analysis of infrared spectral showed that there are groups of hydroxyl, carboxyl and so on, comprising the hydrolysis of activated sludge, which possesses the potential role of surfactant and which can be used as a surfactant for oil exploration. Besides, xanthan gum is produced via the cultivation of the Xanthomonas Campestris PV. Campestris and optimization the fermentation process conditions. Through the performance of the xanthan gum fermentation broth, it is showed that the xanthan gum fermentation broth has a good chemical stability, capacities of increasing viscosity, good rheological property and strong anti-degradability of mechanical ability. It indicated that it can be a kind of favourable oil-field displacing agent. Moreover, it can be used as one of the components of combination drive system (polymer) for oil exploration.Phase behavior experiment showed that in comparison to other systems, the alkali -xanthan gum-hydrolysis of activated sludge systems have better emulsification, which in file are followed by a separate low-alkaline system, an xanthan gum-hydrolysis of activated sludge system and a separate hydrolysis of activated sludge systems system. The middle phase volume fraction of the hydrolysis of activated sludge (12%,v/v)+xanthan gum (5%,v/v)+Base (0.05%,wt) system is up to 62.5%, the maximum in the ASP compound system. Laboratory physical simulation experiment showed that ASP flooding system is better than the binary flooding system on oil displacement efficiency in condition that the concentration is the same. The oil displacement efficiency of the low-alkaline (pH 11.5) ASP system: hydrolysis of activated sludge (8%, v/v) + xanthan gum (8%, v/v) + alkali (0.1%, wt) can reach to 20.73%, of which the total oil displacement efficiency is 60.0%. It is higher than the commonly used by oilfield ASP system of the sodium petroleum sulfonate (0.6 %, wt) + polyacrylamide (1.2%, wt) + base (0.05%, wt) system, of which the total oil displacement efficiency is 58.34%. This result shows that the low base of the hydrolysis of activated sludge and xanthan gum fermentation broth composite system have the potential to enhance oil recovery, which will have a high practical value and economic benefits.